Gas sensing properties of single-wall carbon nanotubes dispersed with dimethylformamide

Kyongsoo Lee, Jin Woo Lee, Ki Young Dong, Byeong Kwon Ju

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


For NO2 gas sensing, we deposited single-walled carbon nanotubes (SWCNTs) on a pair of interdigitated electrodes (IDEs) by using a simple casting method. In order to achieve well-dispersed SWCNTs, we dispersed the as-grown SWCNT powder into dimethylformamide (DMF). We selected DMF as one of the candidate materials to ravel the entangled SWCNT bundles because the amide group could easily attach to the surface of the nanotubes. The resultant SWCNTs were well separated. However, the SWCNTs dispersed in DMF required a heat treatment to eliminate the DMF molecules adsorbed on the surface of the SWCNTs. Therefore, we heated the SWCNTs on the IDEs to 350 °C for 1, 2, 3, and 5 h, to remove the outer DMF adsorbed layers. The assembled sensors were exposed to NO2 of 3 and 10 ppm concentrations. We attributed the NO2 gas sensing to the direct charge transfer from the physically adsorbed molecules to the individual p-type semiconducting SWCNTs.

Original languageEnglish
Pages (from-to)214-218
Number of pages5
JournalSensors and Actuators, B: Chemical
Issue number1
Publication statusPublished - 2008 Dec 10

Bibliographical note

Funding Information:
This work was supported by the National Research Laboratory (NRL) (R0A-2007-000-20111-0) Program of the Ministry of Science and Technology in Korea Science and partially supported by a Korea University Grant. We thank the government for financial support.


  • Carbon nanotube
  • Dimethylformamide
  • Gas sensor
  • Nitrogen dioxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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